720216225 has 24 divisors (see below), whose sum is σ = 1323065120. Its totient is φ = 384114960.

The previous prime is 720216199. The next prime is 720216239. The reversal of 720216225 is 522612027.

It is not a de Polignac number, because 720216225 - 2⁵ = 720216193 is a prime.

It is a super-2 number, since 2×720216225² = 1037422821506501250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 532819 + ... + 534168.

Almost surely, 2^720216225 is an apocalyptic number.

720216225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

720216225 is a deficient number, since it is larger than the sum of its proper divisors (602848895).

720216225 is a wasteful number, since it uses less digits than its factorization.

720216225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067006 (or 1066995 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 720216225 is about 26836.8445425314. The cubic root of 720216225 is about 896.3706617890.

The spelling of 720216225 in words is "seven hundred twenty million, two hundred sixteen thousand, two hundred twenty-five".